請問arpwatch的log訊息解讀 - Linux

我知道arpwatch是一個偵測網路IP偽裝的工具
但對於他的用法和送出的log訊息不太了解
想上來問一下有沒有版友在研究這隻tool:
請問log裡面有 sent bad hardware format這代表什麼意思?


http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=155182


Aug 2 02:01:40 xantha arpwatch: listening on eth0
Aug 2 02:01:54 xantha arpwatch: new station 172.16.22.88 0:a0:24:c0:9f:0
Aug 2 02:01:54 xantha arpwatch: new station 172.16.22.1 0:80:c8:cd:1d:41
Aug 2 02:01:56 xantha arpwatch: new station 172.16.22.65 8:0:20:4:c7:ed
Aug 2 02:01:59 xantha arpwatch: new station 172.16.22.89 0:c0:32:0:a3:ae
Aug 2 02:02:01 xantha arpwatch: new station 172.16.22.68 8:0:20:4:c7:ed
Aug 2 02:02:41 ysolde arpwatch: listening on eth0
Aug 2 02:02:41 xantha arpwatch: new station 172.16.22.8 0:50:4:fe:7e:3c
Aug 2 02:02:43 ysolde arpwatch: 0:50:4:fe:7e:3c sent bad hardware format
0x800
Aug 2 02:02:46 ysolde arpwatch: 0:80:c8:cd:1d:41 sent bad hardware format
0x800
Aug 2 02:02:46 ysolde arpwatch: short (want 44)
Aug 2 02:02:51 ysolde arpwatch: 0:a0:24:c0:9f:0 sent bad hardware format
0x800

請問"sent bad hardware format"，這個訊息是什麼意思?
我已經google了一整天，但是網路上關於arpwatch的討論很少
所以上來問一下，謝謝

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